I know that these are some older documents, however I had not seen these docs on Microsoft Identity and Access Management
before.  I found them linked from another web site I was
reading.  There is some interesting stuff .  From their site:

This series of papers provides numerous identity and access management
concepts, techniques, and solutions for use in heterogeneous IT
environments.

Identity and access management combines processes, technologies, and
policies to manage digital identities and specify how they are used to access
resources.

I’m reading through the package for some background.